2 * Copyright (C) 1995-1999 Jeffrey A. Uphoff
3 * Major rewrite by Olaf Kirch, Dec. 1996.
4 * Modified by H.J. Lu, 1998.
5 * Tighter access control, Olaf Kirch June 1999.
21 #include <arpa/inet.h>
26 #include "ha-callout.h"
28 notify_list * rtnl = NULL; /* Run-time notify list. */
30 #define LINELEN (4*(8+1)+SM_PRIV_SIZE*2+1)
33 * Reject requests from non-loopback addresses in order
34 * to prevent attack described in CERT CA-99.05.
37 caller_is_localhost(struct svc_req *rqstp)
39 struct in_addr caller;
41 caller = svc_getcaller(rqstp->rq_xprt)->sin_addr;
42 if (caller.s_addr != htonl(INADDR_LOOPBACK)) {
44 "Call to statd from non-local host %s",
52 * Services SM_MON requests.
55 sm_mon_1_svc(struct mon *argp, struct svc_req *rqstp)
57 static sm_stat_res result;
58 char *mon_name = argp->mon_id.mon_name,
59 *my_name = argp->mon_id.my_id.my_name;
60 struct my_id *id = &argp->mon_id.my_id;
65 struct in_addr my_addr;
67 struct hostent *hostinfo = NULL;
69 /* Assume that we'll fail. */
70 result.res_stat = STAT_FAIL;
71 result.state = -1; /* State is undefined for STAT_FAIL. */
73 /* 1. Reject any remote callers.
74 * Ignore the my_name specified by the caller, and
75 * use "127.0.0.1" instead.
77 if (!caller_is_localhost(rqstp))
79 my_addr.s_addr = htonl(INADDR_LOOPBACK);
81 /* 2. Reject any registrations for non-lockd services.
83 * This is specific to the linux kernel lockd, which
84 * makes the callback procedure part of the lockd interface.
85 * It is also prone to break when lockd changes its callback
86 * procedure number -- which, in fact, has now happened once.
87 * There must be a better way.... XXX FIXME
89 if (id->my_prog != 100021 ||
90 (id->my_proc != 16 && id->my_proc != 24))
93 "Attempt to register callback to %d/%d",
94 id->my_prog, id->my_proc);
99 * Check hostnames. If I can't look them up, I won't monitor. This
100 * might not be legal, but it adds a little bit of safety and sanity.
103 /* must check for /'s in hostname! See CERT's CA-96.09 for details. */
104 if (strchr(mon_name, '/') || mon_name[0] == '.') {
105 note(N_CRIT, "SM_MON request for hostname containing '/' "
106 "or starting '.': %s", mon_name);
107 note(N_CRIT, "POSSIBLE SPOOF/ATTACK ATTEMPT!");
109 } else if ((hostinfo = gethostbyname(mon_name)) == NULL) {
110 note(N_WARNING, "gethostbyname error for %s", mon_name);
114 /* my_name must not have white space */
115 for (cp=my_name ; *cp ; cp++)
116 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
120 * Hostnames checked OK.
121 * Now choose a hostname to use for matching. We cannot
122 * really trust much in the incoming NOTIFY, so to make
123 * sure that multi-homed hosts work nicely, we get an
124 * FQDN now, and use that for matching
126 hostinfo = gethostbyaddr(hostinfo->h_addr,
128 hostinfo->h_addrtype);
130 dnsname = xstrdup(hostinfo->h_name);
132 dnsname = xstrdup(my_name);
134 /* Now check to see if this is a duplicate, and warn if so.
135 * I will also return STAT_FAIL. (I *think* this is how I should
138 * Olaf requests that I allow duplicate SM_MON requests for
139 * hosts due to the way he is coding lockd. No problem,
140 * I'll just do a quickie success return and things should
145 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
146 if (matchhostname(NL_MY_NAME(clnt), my_name) &&
147 NL_MY_PROC(clnt) == id->my_proc &&
148 NL_MY_PROG(clnt) == id->my_prog &&
149 NL_MY_VERS(clnt) == id->my_vers &&
150 memcmp(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE) == 0) {
151 /* Hey! We already know you guys! */
153 "Duplicate SM_MON request for %s "
154 "from procedure on %s",
157 /* But we'll let you pass anyway. */
160 clnt = NL_NEXT(clnt);
164 * We're committed...ignoring errors. Let's hope that a malloc()
165 * doesn't fail. (I should probably fix this assumption.)
167 if (!(clnt = nlist_new(my_name, mon_name, 0))) {
168 note(N_WARNING, "out of memory");
172 NL_ADDR(clnt) = my_addr;
173 NL_MY_PROG(clnt) = id->my_prog;
174 NL_MY_VERS(clnt) = id->my_vers;
175 NL_MY_PROC(clnt) = id->my_proc;
176 memcpy(NL_PRIV(clnt), argp->priv, SM_PRIV_SIZE);
177 clnt->dns_name = dnsname;
180 * Now, Create file on stable storage for host.
183 path=xmalloc(strlen(SM_DIR)+strlen(dnsname)+2);
184 sprintf(path, "%s/%s", SM_DIR, dnsname);
185 if ((fd = open(path, O_WRONLY|O_SYNC|O_CREAT|O_APPEND,
186 S_IRUSR|S_IWUSR)) < 0) {
187 /* Didn't fly. We won't monitor. */
188 note(N_ERROR, "creat(%s) failed: %s", path, strerror (errno));
189 nlist_free(NULL, clnt);
194 char buf[LINELEN + 1 + SM_MAXSTRLEN*2 + 4];
197 e = buf + sprintf(buf, "%08x %08x %08x %08x ",
198 my_addr.s_addr, id->my_prog,
199 id->my_vers, id->my_proc);
200 for (i=0; i<SM_PRIV_SIZE; i++)
201 e += sprintf(e, "%02x", 0xff & (argp->priv[i]));
202 if (e+1-buf != LINELEN) abort();
203 e += sprintf(e, " %s %s\n", mon_name, my_name);
204 write(fd, buf, e-buf);
208 /* PRC: do the HA callout: */
209 ha_callout("add-client", mon_name, my_name, -1);
210 nlist_insert(&rtnl, clnt);
212 dprintf(N_DEBUG, "MONITORING %s for %s", mon_name, my_name);
214 result.res_stat = STAT_SUCC;
215 /* SUN's sm_inter.x says this should be "state number of local site".
216 * X/Open says '"state" will be contain the state of the remote NSM.'
217 * href=http://www.opengroup.org/onlinepubs/9629799/SM_MON.htm
218 * Linux lockd currently (2.6.21 and prior) ignores whatever is
219 * returned, and given the above contraction, it probably always will..
220 * So we just return what we always returned. If possible, we
221 * have already told lockd about our state number via a sysctl.
222 * If lockd wants the remote state, it will need to
223 * use SM_STAT (and prayer).
225 result.state = MY_STATE;
229 note(N_WARNING, "STAT_FAIL to %s for SM_MON of %s", my_name, mon_name);
233 void load_state(void)
237 char buf[LINELEN + 1 + SM_MAXSTRLEN + 2];
242 while ((de = readdir(d))) {
247 if (de->d_name[0] == '.')
249 path = xmalloc(strlen(SM_DIR)+strlen(de->d_name)+2);
250 sprintf(path, "%s/%s", SM_DIR, de->d_name);
251 f = fopen(path, "r");
255 while (fgets(buf, sizeof(buf), f) != NULL) {
256 int addr, proc, prog, vers;
257 char priv[SM_PRIV_SIZE];
258 char *monname, *myname;
263 buf[sizeof(buf)-1] = 0;
264 b = strchr(buf, '\n');
266 sscanf(buf, "%x %x %x %x ",
267 &addr, &prog, &vers, &proc);
269 for (i=0; i<SM_PRIV_SIZE; i++) {
270 sscanf(b, "%2x", &p);
276 while (*b && *b != ' ') b++;
278 while (*b == ' ') b++;
280 clnt = nlist_new(myname, monname, 0);
283 NL_ADDR(clnt).s_addr = addr;
284 NL_MY_PROG(clnt) = prog;
285 NL_MY_VERS(clnt) = vers;
286 NL_MY_PROC(clnt) = proc;
287 clnt->dns_name = xstrdup(de->d_name);
288 memcpy(NL_PRIV(clnt), priv, SM_PRIV_SIZE);
289 nlist_insert(&rtnl, clnt);
300 * Services SM_UNMON requests.
302 * There is no statement in the X/Open spec's about returning an error
303 * for requests to unmonitor a host that we're *not* monitoring. I just
304 * return the state of the NSM when I get such foolish requests for lack
305 * of any better ideas. (I also log the "offense.")
308 sm_unmon_1_svc(struct mon_id *argp, struct svc_req *rqstp)
310 static sm_stat result;
312 char *mon_name = argp->mon_name,
313 *my_name = argp->my_id.my_name;
314 struct my_id *id = &argp->my_id;
317 result.state = MY_STATE;
319 if (!caller_is_localhost(rqstp))
322 /* my_name must not have white space */
323 for (cp=my_name ; *cp ; cp++)
324 if (*cp == ' ' || *cp == '\t' || *cp == '\r' || *cp == '\n')
328 /* Check if we're monitoring anyone. */
331 "Received SM_UNMON request from %s for %s while not "
332 "monitoring any hosts.", my_name, argp->mon_name);
338 * OK, we are. Now look for appropriate entry in run-time list.
339 * There should only be *one* match on this, since I block "duplicate"
340 * SM_MON calls. (Actually, duplicate calls are allowed, but only one
341 * entry winds up in the list the way I'm currently handling them.)
343 while ((clnt = nlist_gethost(clnt, mon_name, 0))) {
344 if (matchhostname(NL_MY_NAME(clnt), my_name) &&
345 NL_MY_PROC(clnt) == id->my_proc &&
346 NL_MY_PROG(clnt) == id->my_prog &&
347 NL_MY_VERS(clnt) == id->my_vers) {
349 dprintf(N_DEBUG, "UNMONITORING %s for %s",
352 /* PRC: do the HA callout: */
353 ha_callout("del-client", mon_name, my_name, -1);
355 xunlink(SM_DIR, clnt->dns_name);
356 nlist_free(&rtnl, clnt);
360 clnt = NL_NEXT(clnt);
364 note(N_WARNING, "Received erroneous SM_UNMON request from %s for %s",
371 sm_unmon_all_1_svc(struct my_id *argp, struct svc_req *rqstp)
374 static sm_stat result;
376 char *my_name = argp->my_name;
378 if (!caller_is_localhost(rqstp))
381 result.state = MY_STATE;
384 note(N_WARNING, "Received SM_UNMON_ALL request from %s "
385 "while not monitoring any hosts", my_name);
390 while ((clnt = nlist_gethost(clnt, my_name, 1))) {
391 if (NL_MY_PROC(clnt) == argp->my_proc &&
392 NL_MY_PROG(clnt) == argp->my_prog &&
393 NL_MY_VERS(clnt) == argp->my_vers) {
395 char mon_name[SM_MAXSTRLEN + 1];
399 "UNMONITORING (SM_UNMON_ALL) %s for %s",
400 NL_MON_NAME(clnt), NL_MY_NAME(clnt));
401 strncpy(mon_name, NL_MON_NAME(clnt),
402 sizeof (mon_name) - 1);
403 mon_name[sizeof (mon_name) - 1] = '\0';
404 temp = NL_NEXT(clnt);
405 /* PRC: do the HA callout: */
406 ha_callout("del-client", mon_name, my_name, -1);
407 xunlink(SM_DIR, clnt->dns_name);
408 nlist_free(&rtnl, clnt);
412 clnt = NL_NEXT(clnt);
416 dprintf(N_DEBUG, "SM_UNMON_ALL request from %s with no "
417 "SM_MON requests from it.", my_name);